FKIE_CVE-2026-74441

Vulnerability from fkie_nvd - Published: 2026-08-15 13:17 - Updated: 2026-08-23 13:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: Fix race condition and ordering in port unregistration A synchronization issue exists during port unregistration where pending partner work items can race against workqueue destruction, leading to use-after-free conditions: cros_ec_ucsi cros_ec_ucsi.3.auto: error -ETIMEDOUT: PPM init failed BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:__queue_work+0x83/0x4a0 Call Trace: <IRQ> __cfi_delayed_work_timer_fn+0x10/0x10 run_timer_softirq+0x3b6/0xbd0 sched_clock_cpu+0xc/0x110 irq_exit_rcu+0x18d/0x330 fred_sysvec_apic_timer_interrupt+0x5e/0x80 Fix this by ensuring strict ordering and proper serialization during teardown: 1. Move ucsi_unregister_partner() to the beginning of the teardown sequence and protect it under the connector mutex lock. 2. Ensure all pending partner tasks are explicitly flushed and finished before the workqueue is destroyed. 3. Switch from mod_delayed_work() to a cancel_delayed_work() and queue_delayed_work() sequence. This guarantees that items currently marked as pending won't be scheduled an additional time, preventing a double release of resources which leads to the following crash: Oops: general protection fault, probably for non-canonical address 0xdead000000000122: 0000 [#1] SMP NOPTI Workqueue: cros_ec_ucsi.3.auto-con2 ucsi_poll_worker RIP: 0010:ucsi_poll_worker+0x65/0x1e0 Call Trace: <TASK> process_scheduled_works+0x218/0x6d0 worker_thread+0x188/0x3f0 __cfi_worker_thread+0x10/0x10 kthread+0x226/0x2a0 To ensure these rules are applied identically across both the normal teardown and the ucsi_init() error paths, consolidate the cleanup logic into a new helper, ucsi_unregister_port().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/07f8aaffee705e552c1f723ac8bf7eb137ad59c2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/11483d80267db97fbe49f2df66385434256cc3b0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f7b3728dd9011c915cbeaea77274ebe8366550d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7aa7d4bf9d3fa9a6a47b640ad103ab433b7ff261
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7b63c680ff605f60f056e5f2c323f1a602aee182
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bc7a0f721123ea260a42f1ded06dab844ba49434
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/ucsi/ucsi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7b63c680ff605f60f056e5f2c323f1a602aee182",
              "status": "affected",
              "version": "b9aa02ca39a49740926c2c450a1505a4a0f8954a",
              "versionType": "git"
            },
            {
              "lessThan": "07f8aaffee705e552c1f723ac8bf7eb137ad59c2",
              "status": "affected",
              "version": "b9aa02ca39a49740926c2c450a1505a4a0f8954a",
              "versionType": "git"
            },
            {
              "lessThan": "11483d80267db97fbe49f2df66385434256cc3b0",
              "status": "affected",
              "version": "b9aa02ca39a49740926c2c450a1505a4a0f8954a",
              "versionType": "git"
            },
            {
              "lessThan": "3f7b3728dd9011c915cbeaea77274ebe8366550d",
              "status": "affected",
              "version": "b9aa02ca39a49740926c2c450a1505a4a0f8954a",
              "versionType": "git"
            },
            {
              "lessThan": "bc7a0f721123ea260a42f1ded06dab844ba49434",
              "status": "affected",
              "version": "b9aa02ca39a49740926c2c450a1505a4a0f8954a",
              "versionType": "git"
            },
            {
              "lessThan": "7aa7d4bf9d3fa9a6a47b640ad103ab433b7ff261",
              "status": "affected",
              "version": "b9aa02ca39a49740926c2c450a1505a4a0f8954a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/typec/ucsi/ucsi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: Fix race condition and ordering in port unregistration\n\nA synchronization issue exists during port unregistration where pending\npartner work items can race against workqueue destruction, leading to\nuse-after-free conditions:\n\n  cros_ec_ucsi cros_ec_ucsi.3.auto: error -ETIMEDOUT: PPM init failed\n  BUG: kernel NULL pointer dereference, address: 0000000000000000\n  RIP: 0010:__queue_work+0x83/0x4a0\n  Call Trace:\n    \u003cIRQ\u003e\n    __cfi_delayed_work_timer_fn+0x10/0x10\n    run_timer_softirq+0x3b6/0xbd0\n    sched_clock_cpu+0xc/0x110\n    irq_exit_rcu+0x18d/0x330\n    fred_sysvec_apic_timer_interrupt+0x5e/0x80\n\nFix this by ensuring strict ordering and proper serialization during\nteardown:\n\n1. Move ucsi_unregister_partner() to the beginning of the teardown\nsequence and protect it under the connector mutex lock.\n2. Ensure all pending partner tasks are explicitly flushed and finished\nbefore the workqueue is destroyed.\n3. Switch from mod_delayed_work() to a cancel_delayed_work() and\nqueue_delayed_work() sequence. This guarantees that items currently marked\nas pending won\u0027t be scheduled an additional time, preventing a double\nrelease of resources which leads to the following crash:\n\n  Oops: general protection fault, probably for non-canonical address\n    0xdead000000000122: 0000 [#1] SMP NOPTI\n  Workqueue: cros_ec_ucsi.3.auto-con2 ucsi_poll_worker\n  RIP: 0010:ucsi_poll_worker+0x65/0x1e0\n  Call Trace:\n  \u003cTASK\u003e\n    process_scheduled_works+0x218/0x6d0\n    worker_thread+0x188/0x3f0\n    __cfi_worker_thread+0x10/0x10\n    kthread+0x226/0x2a0\n\nTo ensure these rules are applied identically across both the normal\nteardown and the ucsi_init() error paths, consolidate the cleanup logic\ninto a new helper, ucsi_unregister_port()."
    }
  ],
  "id": "CVE-2026-74441",
  "lastModified": "2026-08-23T13:16:43.717",
  "metrics": {},
  "published": "2026-08-15T13:17:48.643",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/07f8aaffee705e552c1f723ac8bf7eb137ad59c2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/11483d80267db97fbe49f2df66385434256cc3b0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3f7b3728dd9011c915cbeaea77274ebe8366550d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7aa7d4bf9d3fa9a6a47b640ad103ab433b7ff261"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7b63c680ff605f60f056e5f2c323f1a602aee182"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bc7a0f721123ea260a42f1ded06dab844ba49434"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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